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Crystal chemistry of vanadium-bearing Ellestadite waste forms
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Fang, Yanan, Page, Samuel J., Rees, Gregory J., Avdeev, Maxim, Hanna, John V. and White, Tim J. (2018) Crystal chemistry of vanadium-bearing Ellestadite waste forms. Inorganic Chemistry, 57 (15). pp. 9122-9132. doi:10.1021/acs.inorgchem.8b01160 ISSN 0020-1669.
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Official URL: http://dx.doi.org/10.1021/acs.inorgchem.8b01160
Abstract
Vanadate ellestadites Ca10(SiO4)x(VO4)6–2x(SO4)xCl2, serving as prototype crystalline matrices for the fixation of pentavalent toxic metals (V, Cr, As), were synthesized and characterized by powder X-ray and neutron diffraction (PXRD and PND), electron probe microanalysis (EPMA), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (SS-NMR). The ellestadites 0.19 < x < 3 adopt the P63/m structure, while the vanadate endmember Ca10(VO4)6Cl2 is triclinic with space group P1̅. A miscibility gap exists for 0.77 < x < 2.44. The deficiency of Cl in the structure leads to short-range disorder in the tunnel. Toxicity characteristic leaching testing (TCLP) showed the incorporation of vanadium increases ellestadite solubility, and defined a waste loading limit that should not exceed 25 atom % V to ensure small release levels.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | Inorganic Chemistry | ||||||||
Publisher: | American Chemical Society | ||||||||
ISSN: | 0020-1669 | ||||||||
Official Date: | 6 August 2018 | ||||||||
Dates: |
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Volume: | 57 | ||||||||
Number: | 15 | ||||||||
Page Range: | pp. 9122-9132 | ||||||||
DOI: | 10.1021/acs.inorgchem.8b01160 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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